61311015975 has 24 divisors (see below), whose sum is σ = 110582779392. Its totient is φ = 29726552800.

The previous prime is 61311015973. The next prime is 61311015991. The reversal of 61311015975 is 57951011316.

It is not a de Polignac number, because 61311015975 - 2¹ = 61311015973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311015973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37157367 + ... + 37159016.

It is an arithmetic number, because the mean of its divisors is an integer number (4607615808).

Almost surely, 2^61311015975 is an apocalyptic number.

61311015975 is a deficient number, since it is larger than the sum of its proper divisors (49271763417).

61311015975 is a wasteful number, since it uses less digits than its factorization.

61311015975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74316407 (or 74316402 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 39.

The spelling of 61311015975 in words is "sixty-one billion, three hundred eleven million, fifteen thousand, nine hundred seventy-five".